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Condensed Matter > Superconductivity
Title: Origin of superconductivity in tungsten thin films
(Submitted on 16 Dec 2023 (v1), last revised 19 Dec 2023 (this version, v2))
Abstract: The most common allotrope of tungsten, {\alpha}-W, has a superconducting transition at a temperature of ~11 mK. However, two other forms of tungsten have been reported to have superconducting transitions in the temperature range Tc ~ 2-5 K when synthesized as thin films: Crystalline \b{eta}-W and amorphous W (a-W). In this work we carry out a systematic study of W films synthesized using d.c. magnetron sputtering, using transport, low frequency magnetic shielding response, and transmission electron microscopy. Our results show that while a-W is indeed a bulk superconductor, superconductivity in \b{eta}-W probably originates from an amorphous phase that forms along with the \b{eta}-W phase. Our findings reconcile some of the anomalies earlier reported in \b{eta}-W, such the very small superconducting gap and the decrease of Tc with increase in film thickness.
Submission history
From: Pratap Raychaudhuri [view email][v1] Sat, 16 Dec 2023 07:59:26 GMT (1148kb)
[v2] Tue, 19 Dec 2023 06:26:46 GMT (1428kb)
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